I just ordered some spare parts from Deer Creek this morning. They said they have all parts and wood for the underhammers, except barrels. The breech plug they use IS in stock, so a GM barrel would work. I'll probably order all the other parts and make up a spare barrel for mine this summer. Give them a call at (765) 525-6181. They even had lock parts for my Wilderness rifle, so I was pretty happy :grin: